--- name: "ipsec.conf" section: "5" platform: "openbsd" package: "man" version: "8.0-current-20261101" release: "OpenBSD 8.0-current (2026-11-01)" platforms: ["linux", "openbsd"] url: "https://new.carta.tech/ipsec.conf" --- # ipsec.conf(5) IPsec configuration file ## NAME **ipsec.conf** – IPsec configuration file ## DESCRIPTION The **ipsec.conf** file specifies rules and definitions for IPsec, which provides security services for IP datagrams. IPsec itself is a pair of protocols: Encapsulating Security Payload (ESP), which provides integrity and confidentiality; and Authentication Header (AH), which provides integrity. The IPsec protocol itself is described in [ipsec(4)](/ipsec/4.md). In its most basic form, a *flow* is established between hosts and/or networks, and then Security Associations (SAs) are established, which detail how the desired protection will be achieved. IPsec uses flows to determine whether to apply security services to an IP packet or not. Generally speaking an automated keying daemon, such as [isakmpd(8)](/isakmpd/8.md), is used to set up flows and establish SAs, by specifying an ‘ike’ line in **ipsec.conf** (see AUTOMATIC KEYING, below). An authentication method, such as public key authentication, will also have to be set up: see the PKI section of [isakmpd(8)](/isakmpd/8.md) for information on the types of authentication available, and the procedures for setting them up. The keying daemon, [isakmpd(8)](/isakmpd/8.md), can be enabled to run at boot time via “rcctl enable isakmpd”. Note that to avoid [keynote(4)](/keynote/4.md) policy checking, it will probably need to be run with at least the **-K** option via the “rcctl set isakmpd flags -K” command which sets ``` isakmpd_flags="-K" ``` in rc.conf.local(8). The **ipsec.conf** configuration itself is loaded at boot time if IPsec is enabled by using “rcctl enable ipsec”, which sets ``` ipsec=YES ``` in rc.conf.local(8). A utility called [ipsecctl(8)](/ipsecctl/8.md) is also available to load **ipsec.conf** configurations, and can additionally be used to view and modify IPsec flows. An alternative method of setting up SAs is also possible using manual keying. Manual keying is not recommended, but can be convenient for quick setups and testing. Those procedures are documented within this page. ## IPSEC.CONF FILE FORMAT The current line can be extended over multiple lines using a backslash (‘\\’). Comments can be put anywhere in the file using a hash mark (‘#’), and extend to the end of the current line. Care should be taken when commenting out multi-line text: the comment is effective until the end of the entire block. Arguments not beginning with a letter, digit, or underscore must be quoted. Addresses can be specified in CIDR notation (matching netblocks), as symbolic host names, interface names, or interface group names. Certain parameters can be expressed as lists, in which case [ipsecctl(8)](/ipsecctl/8.md) generates all the necessary combinations. For example: ``` ike esp from {192.168.1.1, 192.168.1.2} to \ {10.0.0.17, 10.0.0.18} peer 192.168.10.1 ``` Will expand to: ``` ike esp from 192.168.1.1 to 10.0.0.17 peer 192.168.10.1 ike esp from 192.168.1.1 to 10.0.0.18 peer 192.168.10.1 ike esp from 192.168.1.2 to 10.0.0.17 peer 192.168.10.1 ike esp from 192.168.1.2 to 10.0.0.18 peer 192.168.10.1 ``` A macro is defined with a command of the form *name*=*value*. The macro *name* can contain letters, digits, and underscores and cannot be a reserved word (for example, **flow**, **from**, or **esp**). Within unquoted arguments, the string $*name* is later expanded to *value*. For example: ``` remote_gw = "192.168.3.12" flow esp from 192.168.7.0/24 to 192.168.8.0/24 peer $remote_gw ``` Additional configuration files can be included with the **include** keyword, for example: ``` include "/etc/macros.conf" ``` ## AUTOMATIC KEYING In this scenario, **ipsec.conf** is used to set up flows and SAs automatically using [isakmpd(8)](/isakmpd/8.md) with the ISAKMP/Oakley a.k.a. IKEv1 protocol. To configure automatic keying using the IKEv2 protocol, see [iked.conf(5)](/iked.conf/5.md) instead. Some examples of setting up automatic keying: ``` # Set up a VPN: # First between the gateway machines 192.168.3.1 and 192.168.3.2 # Second between the networks 10.1.1.0/24 and 10.1.2.0/24 ike esp from 192.168.3.1 to 192.168.3.2 ike esp from 10.1.1.0/24 to 10.1.2.0/24 peer 192.168.3.2 ``` The commands are as follows: - **ike** \[*mode*\] \[*encap*\] \[*tmode*\] *mode* specifies the IKEv1 mode to use: one of *passive*, *active*, or *dynamic*. When *passive* is specified, [isakmpd(8)](/isakmpd/8.md) will not immediately start negotiation of this tunnel, but wait for an incoming request from the remote peer. When *active* or *dynamic* is specified, negotiation will be started at once. The *dynamic* mode will additionally enable Dead Peer Detection (DPD) and use the local hostname as the identity of the local peer, if not specified by the **srcid** parameter. *dynamic* mode should be used for hosts with dynamic IP addresses like road warriors or dialup hosts. If omitted, *active* mode will be used. *encap* specifies the encapsulation protocol to be used. Possible protocols are *esp* and *ah*; the default is *esp*. *tmode* describes the encapsulation mode to be used. Possible modes are *tunnel* and *transport*; the default is *tunnel*. - **proto** *protocol* The optional **proto** parameter restricts the flow to a specific IP protocol. Common protocols are [icmp(4)](/icmp/4.md), [tcp(4)](/tcp/4.md), and [udp(4)](/udp/4.md). For a list of all the protocol name to number mappings used by [ipsecctl(8)](/ipsecctl/8.md), see the file */etc/protocols*. - **from** *src* \[**port** *sport*\] \[(*srcnat*)\] **to** *dst* \[**port** *dport*\] This rule applies for packets with source address *src* and destination address *dst*. The keyword *any* will match any address (i.e. 0.0.0.0/0). If the *src* argument specifies a fictional source ID, the *srcnat* parameter can be used to specify the actual source address. This can be used in outgoing NAT/BINAT scenarios as described below in OUTGOING NETWORK ADDRESS TRANSLATION. Host addresses are parsed as type “IPV4\_ADDR”; adding the suffix /32 will change the type to “IPV4\_ADDR\_SUBNET”, which can improve interoperability with some IKEv1 implementations. The optional **port** modifiers restrict the flows to the specified ports. They are only valid in conjunction with the [tcp(4)](/tcp/4.md) and [udp(4)](/udp/4.md) protocols. Ports can be specified by number or by name. For a list of all port name to number mappings used by [ipsecctl(8)](/ipsecctl/8.md), see the file */etc/services*. - **local** *localip* **peer** *remote* The **local** parameter specifies the address or FQDN of the local endpoint. Unless we are multi-homed or have aliases, this parameter is generally not needed. This parameter does not affect the set of IP addresses [isakmpd(8)](/isakmpd/8.md) will listen on and send packets from. The *Listen-on* directive in [isakmpd.conf(5)](/isakmpd.conf/5.md) should additionally be used to ensure that the local endpoint will send IKE messages with an appropriate source IP address. The **peer** parameter specifies the address or FQDN of the remote endpoint. For host-to-host connections where *dst* is identical to *remote*, this option is generally not needed as it will be set to *dst* automatically. If it is not specified or if the keyword *any* is given, the default peer is used. - *mode* **auth** *algorithm* **enc** *algorithm* **group** *group* **lifetime** *time* These parameters define the mode and cryptographic transforms to be used for the phase 1 negotiation. During phase 1 the machines authenticate and set up an encrypted channel. The mode can be either *main*, which specifies main mode, or *aggressive*, which specifies aggressive mode. Possible values for **auth**, **enc**, and **group** are described below in CRYPTO TRANSFORMS. The **lifetime** parameter specifies the phase 1 lifetime in seconds. Two unit specifiers are recognized (ignoring case): ‘m’ and ‘h’ for minutes and hours, respectively. If omitted, [ipsecctl(8)](/ipsecctl/8.md) will use the default values *main*, *hmac-sha1*, *aes*, *modp3072*, and *3600*. - **quick** **auth** *algorithm* **enc** *algorithm* **group** *group* **lifetime** *time* These parameters define the cryptographic transforms to be used for the phase 2 negotiation. During phase 2 the actual IPsec negotiations happen. Possible values for **auth**, **enc**, and **group** are described below in CRYPTO TRANSFORMS. Perfect Forward Secrecy (PFS) is enabled unless **group** *none* is specified. The **lifetime** parameter specifies the phase 2 lifetime in seconds. Two unit specifiers are recognized (ignoring case): ‘m’ and ‘h’ for minutes and hours, respectively. If omitted, [ipsecctl(8)](/ipsecctl/8.md) will use the default values *hmac-sha2-256* and *aes*; PFS will only be used if the remote side requests it. The default phase 2 lifetime value is *1200*. - **srcid** *string* **dstid** *string* **srcid** defines an ID of type “USER\_FQDN” or “FQDN” that will be used by [isakmpd(8)](/isakmpd/8.md) as the identity of the local peer. If the argument is an email address (bob@example.com), [ipsecctl(8)](/ipsecctl/8.md) will use USER\_FQDN as the ID type. Anything else is considered to be an FQDN. If **srcid** is omitted, the default is to use the IP address of the connecting machine. **dstid** is similar to **srcid**, but instead specifies the ID to be used by the remote peer. - **psk** *string* Use a pre-shared key *string* for authentication. If this option is not specified, public key authentication is used (see [isakmpd(8)](/isakmpd/8.md)). - **tag** *string* Add a [pf(4)](/pf/4.md) tag to all packets of phase 2 SAs created for this connection. This will allow matching packets for this connection by defining rules in [pf.conf(5)](/pf.conf/5.md) using the **tagged** keyword. The following variables can be used in tags to include information from the remote peer on runtime: - *$id* The remote phase 1 ID. It will be expanded to *id-type/id-value*, e.g. *fqdn/foo.bar.org*. - *$domain* Extract the domain from IDs of type FQDN or UFQDN. For example, if the ID is *fqdn/foo.bar.org* or *ufqdn/user@bar.org*, “ipsec-$domain” expands to “ipsec-bar.org”. The variable expansion for the *tag* directive occurs only at runtime (not when the file is parsed) and must be quoted, or it will be interpreted as a macro. ## PACKET FILTERING IPsec traffic appears unencrypted on the [enc(4)](/enc/4.md) interface and can be filtered accordingly using the OpenBSD packet filter, [pf(4)](/pf/4.md). The grammar for the packet filter is described in [pf.conf(5)](/pf.conf/5.md). The following components are relevant to filtering IPsec traffic: - external interface Interface for ISAKMP traffic and encapsulated IPsec traffic. - proto udp port 500 ISAKMP traffic on the external interface. - proto udp port 4500 ISAKMP NAT-Traversal traffic on the external interface. - proto ah \| esp Encapsulated IPsec traffic on the external interface. - enc0 Interface for outgoing traffic before it's been encapsulated, and incoming traffic after it's been decapsulated. State on this interface should be interface bound; see [enc(4)](/enc/4.md) for further information. - proto ipencap \[tunnel mode only\] IP-in-IP traffic flowing between gateways on the enc0 interface. - tagged ipsec-example.org Match traffic of phase 2 SAs using the **tag** keyword. If the filtering rules specify to block everything by default, the following rule would ensure that IPsec traffic never hits the packet filtering engine, and is therefore passed: ``` set skip on enc0 ``` In the following example, all traffic is blocked by default. IPsec-related traffic from gateways {192.168.3.1, 192.168.3.2} and networks {10.0.1.0/24, 10.0.2.0/24} is permitted. ``` block on sk0 block on enc0 pass in on sk0 proto udp from 192.168.3.2 to 192.168.3.1 \ port {500, 4500} pass out on sk0 proto udp from 192.168.3.1 to 192.168.3.2 \ port {500, 4500} pass in on sk0 proto esp from 192.168.3.2 to 192.168.3.1 pass out on sk0 proto esp from 192.168.3.1 to 192.168.3.2 pass in on enc0 proto ipencap from 192.168.3.2 to 192.168.3.1 \ keep state (if-bound) pass out on enc0 proto ipencap from 192.168.3.1 to 192.168.3.2 \ keep state (if-bound) pass in on enc0 from 10.0.2.0/24 to 10.0.1.0/24 \ keep state (if-bound) pass out on enc0 from 10.0.1.0/24 to 10.0.2.0/24 \ keep state (if-bound) ``` [pf(4)](/pf/4.md) has the ability to filter IPsec-related packets based on an arbitrary *tag* specified within a ruleset. The tag is used as an internal marker which can be used to identify the packets later on. This could be helpful, for example, in scenarios where users are connecting in from differing IP addresses, or to support queue-based bandwidth control, since the enc0 interface does not support it. The following [pf.conf(5)](/pf.conf/5.md) fragment uses queues for all IPsec traffic with special handling for developers and employees: ``` queue std on sk0 bandwidth 100M queue deflt parent std bandwidth 10M default queue developers parent std bandwidth 75M queue employees parent std bandwidth 5M queue ipsec parent std bandwidth 10M pass out on sk0 proto esp set queue ipsec pass out on sk0 tagged ipsec-developers.bar.org set queue developers pass out on sk0 tagged ipsec-employees.bar.org set queue employees ``` The tags will be assigned by the following **ipsec.conf** example: ``` ike esp from 10.1.1.0/24 to 10.1.2.0/24 peer 192.168.3.2 \ tag "ipsec-$domain" ``` ## OUTGOING NETWORK ADDRESS TRANSLATION In some network topologies it is desirable to perform NAT on traffic leaving through the VPN tunnel. In order to achieve that, the *src* argument is used to negotiate the desired network ID with the peer and the *srcnat* parameter defines the true local subnet, so that a correct SA can be installed on the local side. For example, if the local subnet is 192.168.1.0/24 and all the traffic for a specific VPN peer should appear as coming from 10.10.10.1, the following configuration is used: ``` ike esp from 10.10.10.1 (192.168.1.0/24) to 192.168.2.0/24 \ peer 10.10.20.1 ``` Naturally, a relevant NAT rule is required in [pf.conf(5)](/pf.conf/5.md). For the example above, this would be: ``` match out on enc0 from 192.168.1.0/24 to 192.168.2.0/24 \ nat-to 10.10.10.1 ``` From the peer's point of view, the local end of the VPN tunnel is declared to be 10.10.10.1 and all the traffic arrives with that source address. ## CRYPTO TRANSFORMS It is very important that keys are not guessable. One practical way of generating keys is to use [openssl(1)](/openssl/1.md). The following generates a 160-bit (20-byte) key: ``` $ openssl rand -hex 20 ``` The following authentication types are permitted with the **auth** keyword: | | | | | --- | --- | --- | | *Authentication* | *Key Length* | | | hmac-md5 | 128 bits | | | hmac-ripemd160 | 160 bits | \[phase 2 only\] | | hmac-sha1 | 160 bits | | | hmac-sha2-256 | 256 bits | | | hmac-sha2-384 | 384 bits | | | hmac-sha2-512 | 512 bits | | The following cipher types are permitted with the **enc** keyword: | | | | | --- | --- | --- | | *Cipher* | *Key Length* | | | 3des | 168 bits | | | aes | 128-256 bits | | | aes-128 | 128 bits | | | aes-192 | 192 bits | | | aes-256 | 256 bits | | | aesctr | 160 bits | \[phase 2 only, IKE only\] | | aes-128-ctr | 160 bits | \[phase 2 only, IKE only\] | | aes-192-ctr | 224 bits | \[phase 2 only, IKE only\] | | aes-256-ctr | 288 bits | \[phase 2 only, IKE only\] | | aes-128-gcm | 160 bits | \[phase 2 only, IKE only\] | | aes-192-gcm | 224 bits | \[phase 2 only, IKE only\] | | aes-256-gcm | 288 bits | \[phase 2 only, IKE only\] | | blowfish | 160 bits | | | cast128 | 128 bits | | | chacha20-poly1305 | 288 bits | | The following cipher types provide only authentication, not encryption: | | | | | --- | --- | --- | | aes-128-gmac | 160 bits | \[phase 2 only, IKE only\] | | aes-192-gmac | 224 bits | \[phase 2 only, IKE only\] | | aes-256-gmac | 288 bits | \[phase 2 only, IKE only\] | | null | (none) | \[phase 2 only\] | Transforms followed by \[IKE only\] can only be used with the **ike** keyword; transforms with \[phase 2 only\] can only be used with the **quick** keyword. 3DES requires 24 bytes to form its 168-bit key. This is because the most significant bit of each byte is used for parity. The keysize of AES-CTR can be 128, 192, or 256 bits. However as well as the key, a 32-bit nonce has to be supplied. Thus 160, 224, or 288 bits of key material, respectively, have to be supplied. The same applies to AES-GCM, AES-GMAC and ChaCha20-Poly1305, however in the latter case the keysize is 256 bits. Using AES-GMAC or NULL with ESP will only provide authentication. This is useful in setups where AH cannot be used, e.g. when NAT is involved. The following group types are permitted with the **group** keyword: | | | | | --- | --- | --- | | *Group* | *Size* | | | modp768 | 768 | \[DH group 1\] | | modp1024 | 1024 | \[DH group 2\] | | modp1536 | 1536 | \[DH group 5\] | | modp2048 | 2048 | \[DH group 14\] | | modp3072 | 3072 | \[DH group 15\] | | modp4096 | 4096 | \[DH group 16\] | | modp6144 | 6144 | \[DH group 17\] | | modp8192 | 8192 | \[DH group 18\] | | ecp256 | 256 | \[DH group 19\] | | ecp384 | 384 | \[DH group 20\] | | ecp521 | 512 | \[DH group 21\] | | ecp224 | 224 | \[DH group 26\] | | bp224 | 224 | \[DH group 27\] | | bp256 | 256 | \[DH group 28\] | | bp384 | 384 | \[DH group 29\] | | bp512 | 512 | \[DH group 30\] | | none | 0 | \[phase 2 only\] | ## MANUAL FLOWS In this scenario, **ipsec.conf** is used to set up flows manually. IPsec uses flows to determine whether to apply security services to an IP packet or not. Some examples of setting up flows: ``` # Set up two flows: # First between the machines 192.168.3.14 and 192.168.3.100 # Second between the networks 192.168.7.0/24 and 192.168.8.0/24 flow esp from 192.168.3.14 to 192.168.3.100 flow esp from 192.168.7.0/24 to 192.168.8.0/24 peer 192.168.3.12 ``` The following types of flow are available: - **flow** **esp** ESP can provide the following properties: authentication, integrity, replay protection, and confidentiality of the data. If no flow type is specified, this is the default. - **flow** **ah** AH provides authentication, integrity, and replay protection, but not confidentiality. - **flow** **ipip** IPIP does not provide authentication, integrity, replay protection, or confidentiality. However, it does allow tunnelling of IP traffic over IP, without setting up [gif(4)](/gif/4.md) interfaces. The commands are as follows: - **in** or **out** This rule applies to incoming or outgoing packets. If neither **in** nor **out** are specified, [ipsecctl(8)](/ipsecctl/8.md) will assume the direction **out** for this rule and will construct a proper **in** rule. Thus packets in both directions will be matched. - **proto** *protocol* The optional **proto** parameter restricts the flow to a specific IP protocol. Common protocols are [icmp(4)](/icmp/4.md), [tcp(4)](/tcp/4.md), and [udp(4)](/udp/4.md). For a list of all the protocol name to number mappings used by [ipsecctl(8)](/ipsecctl/8.md), see the file */etc/protocols*. - **from** *src* \[**port** *sport*\] **to** *dst* \[**port** *dport*\] This rule applies for packets with source address *src* and destination address *dst*. The keyword *any* will match any address (i.e. 0.0.0.0/0). The optional **port** modifiers restrict the flows to the specified ports. They are only valid in conjunction with the [tcp(4)](/tcp/4.md) and [udp(4)](/udp/4.md) protocols. Ports can be specified by number or by name. For a list of all port name to number mappings used by [ipsecctl(8)](/ipsecctl/8.md), see the file */etc/services*. - **local** *localip* The **local** parameter specifies the address or FQDN of the local endpoint of this flow and can be usually left out. - **peer** *remote* The **peer** parameter specifies the address or FQDN of the remote endpoint of this flow. For host-to-host connections where *dst* is identical to *remote*, the **peer** specification can be left out as it will be set to *dst* automatically. Only if the keyword *any* is given is a flow without peer created. - **type** *modifier* This optional parameter sets up special flows using modifiers. By default, [ipsecctl(8)](/ipsecctl/8.md) will automatically set up normal flows with the corresponding type. *modifier* may be one of the following: - acquire Use IPsec and establish SAs dynamically. Unencrypted traffic is permitted until it is protected by IPsec. - bypass Matching packets are not processed by IPsec. - deny Matching packets are dropped. - dontacq Use IPsec. If no SAs are available, does not trigger [isakmpd(8)](/isakmpd/8.md). - require Use IPsec and establish SAs dynamically. Unencrypted traffic is not permitted until it is protected by IPsec. - use Use IPsec. Unencrypted traffic is permitted. Does not trigger [isakmpd(8)](/isakmpd/8.md). ## MANUAL SECURITY ASSOCIATIONS (SAs) In this scenario, **ipsec.conf** is used to set up SAs manually. The security parameters for a flow are stored in the Security Association Database (SADB). An example of setting up an SA: ``` # Set up an IPsec SA for flows between 192.168.3.14 and 192.168.3.12 esp from 192.168.3.14 to 192.168.3.12 spi 0xdeadbeef:0xbeefdead \ authkey file "auth14:auth12" enckey file "enc14:enc12" ``` Parameters specify the peers, Security Parameter Index (SPI), cryptographic transforms, and key material to be used. The following rules enter SAs in the SADB: - **esp** Enter an ESP SA. - **ah** Enter an AH SA. - **ipcomp** Enter an IPCOMP SA. - **ipip** Enter an IPIP pseudo SA. - **tcpmd5** Enter a TCP MD5 SA. The commands are as follows: - *mode* For ESP and AH the encapsulation mode can be specified. Possible modes are *tunnel* and *transport*. When left out, *tunnel* is chosen. For details on modes see [ipsec(4)](/ipsec/4.md). - **from** *src* **to** *dst* This SA is for a *flow* between the peers *src* and *dst*. - **spi** *number* The SPI identifies a specific SA. *number* is a 32-bit value and needs to be unique. - **udpencap** \[**port** *dport*\] For NAT-Traversal encapsulate the IPsec traffic in UDP. The port number of the peer can be set to *dport*. - **auth** *algorithm* For ESP and AH an authentication algorithm can be specified. Possible values are described above in CRYPTO TRANSFORMS. If no algorithm is specified, [ipsecctl(8)](/ipsecctl/8.md) will choose *hmac-sha2-256* by default. - **enc** *algorithm* For ESP an encryption algorithm can be specified. Possible values are described above in CRYPTO TRANSFORMS. If no algorithm is specified, [ipsecctl(8)](/ipsecctl/8.md) will choose *aes* by default. - **authkey** *keyspec* *keyspec* defines the authentication key to be used. It is either a hexadecimal string or a path to a file containing the key. The filename may be given as either an absolute path to the file or a relative pathname, and is specified as follows: ``` authkey file "filename" ``` - **enckey** *keyspec* The encryption key is defined similarly to **authkey**. - **bundle** *identifier* Several SAs can be attached to a single flow. The cryptographic transforms are applied in order. The type of the first SA has to match the type of the flow. All SAs with identical *src*, *dst*, and *identifier* are grouped together. - **tcpmd5** **from** *src* **to** *dst* **spi** *number* **authkey** *keyspec* TCP MD5 signatures are generally used between BGP daemons, such as [bgpd(8)](/bgpd/8.md). Since [bgpd(8)](/bgpd/8.md) itself already provides this functionality, this option is generally not needed. More information on TCP MD5 signatures can be found in [tcp(4)](/tcp/4.md), [bgpd.conf(5)](/bgpd.conf/5.md), and RFC 2385. This rule applies for packets with source address *src* and destination address *dst*. The parameter **spi** is a 32-bit value defining the Security Parameter Index (SPI) for this SA. The encryption key is defined similarly to **authkey**. Since an SA is directional, a second SA is normally configured in the reverse direction. This is done by adding a second, colon-separated, value to **spi**, **authkey**, and **enckey**. ## FILES - */etc/ipsec.conf* - */etc/examples/ipsec.conf* ## SEE ALSO [openssl(1)](/openssl/1.md), [enc(4)](/enc/4.md), [ipcomp(4)](/ipcomp/4.md), [ipsec(4)](/ipsec/4.md), [tcp(4)](/tcp/4.md), [pf.conf(5)](/pf.conf/5.md), [ipsecctl(8)](/ipsecctl/8.md), [isakmpd(8)](/isakmpd/8.md) ## HISTORY The **ipsec.conf** file format first appeared in OpenBSD 3.8.